I agree with the WD hitch others have mentioned, but if you are considering a quick trip without one, at least get a drop/rise hitch. They make them in all kind of different sizes and are relatively inexpensive. Even a 4" rise, that can be found at Walmart or any autoparts store, would get the trailer on to the back wheels. Check the weight ratings and remember not all drops have equal ratings when used to raise.
EDIT:
This will do very little to transfer the weight from your van, it will just make the trailer a bit more level. That van is still going to sag in the rear, and the front will still float. The receiver attached to the van will still be very near the ground---might scrape.
Make sure you take as much out of the front of the trailer that you can. Get it loaded further back---preferable over the trailer wheels---which will take some of that weight off the tongue.